Use $(run-program-prefix) in more shell script tests

[Andreas Schwab]

"H.J. Lu" <hjl.tools@gmail.com> writes:

> There is no need to use ${SHELL} since there is "#! /bin/sh".
> Tested on x86-64.  OK to install?

Take a look at 58b668a.

Andreas.

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Andreas Schwab, schwab@linux-m68k.org
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